Allowing multiple forms to be recaptcha'ed with Amasty Invisible Google ReCaptcha for Magento 2

amcaptcha.phtml

<?php
/**
 * @author Amasty Team
 * @copyright Copyright (c) 2017 Amasty (https://www.amasty.com)
 * @package Amasty_InvisibleCaptcha
 */
?>
<?php
/**
 *
 * @see \Amasty\InvisibleCaptcha\Block\Captcha
 * @var \Amasty\InvisibleCaptcha\Block\Captcha $block
 */
?>
<?php if ($block->isModuleOn()) : ?>
    <script type="text/javascript">
        require(['jquery'], function ($) {
            formsToProtect = <?php echo $block->getCaptchaSelectorsJson() ?>;
            formsToProtect.forEach(function(item) {
                formToProtect = $(item)[0];
                if (formToProtect) {
                    if (!window.formsToProtectOnPage || window.formsToProtectOnPage.constructor !== Array) {
                        window.formsToProtectOnPage = Array();
                    }
                    window.formsToProtectOnPage.push(formToProtect);
                    return;
                }
            });
            if (window.formsToProtectOnPage) {
                var recaptchaScript = document.createElement('script');
                recaptchaScript.src = 'https://www.google.com/recaptcha/api.js?onload=onloadCallback&render=explicit';
                recaptchaScript.attributes = 'async defer';
                document.body.appendChild(recaptchaScript);
            }
        });

        var onSubmit = function (formId, token) {
            if (window.validationForInvisibleCaptchaForm[formId].valid()){
                document.getElementById('amasty_invisible_token_' + formId).setAttribute('value', token);
                document.getElementById('amasty_invisible_token_' + formId).form.submit();
            } else {
                grecaptcha.reset(window.grewidgets[formId]);
            }
        };

        var onloadCallback = function () {
            // Loop over forms
            window.formsToProtectOnPage.forEach(function(formToProtect) {
                // Get unique ID
                var formId = formToProtect.id;
                // Add invisible token to form
                formToProtect.innerHTML +=
                    '<input type="hidden" id="amasty_invisible_token_' + formId + '" name="amasty_invisible_token" value=""/>';
                require(['jquery', 'mage/mage'], function ($) {
                    if (!window.validationForInvisibleCaptchaForm || window.validationForInvisibleCaptchaForm.constructor !== Array) {
                        window.validationForInvisibleCaptchaForm = Array();
                    }
                    window.validationForInvisibleCaptchaForm[formId] = $('#' + formId);
                });
                // Create form-specific callback
                if (!window.callBacks || window.callBacks.constructor !== Array) {
                    window.callBacks = Array();
                }
                window.callBacks[formId] = function(token){
                    onSubmit(formId,token);
                };
                // Render recaptcha for form
                var widgetId = grecaptcha.render(formToProtect.querySelector("[type='submit']"), {
                    'sitekey': '<?php echo $block->getSiteKey(); ?>',
                    'callback': window.callBacks[formId]
                });
                if (!window.grewidgets || window.grewidgets.constructor !== Array) {
                    window.grewidgets = Array();
                }
                window.grewidgets[formId] = widgetId;
            });
        };
    </script>
<?php endif; ?>